Need more info on this Bell Board

@Überstationmeister posted:

Paging @Lou N!

@GeoPeg

I designed a single sound set with an OKIdata processor and an EPROM.  After those were sold out, Bill reached out to our electronics vendor and they had a demo board which could be used.  It uses an ISD die attached and wire bonded to the substrate and covered with glob top.  It is the same IC that Ott Machine Services used. 

TechnoMind is long out of business.  The owner, Ken Tong, came in one day and cleaned out the bank accounts and was never seen again.

I may have one floating around on the workbench if you are interested.

On the subject of electronic die......

Ohio has been chosen for a new Intel plant to make wafers and die here in the USA.  A few weeks back Ohio's Lt Governor John Husted paid a visit to my lab class to see just how this is all done.

Lou N

Thanks @Lou N, do you have any info on how to hookup/wire/use this board? Specifically, jumpers - what are they for, and how to use the play record feature? Type of microphone to be used, dynamic, condenser, or given the age perhaps crystal, piezo? Impedance?

Thanks

George

I found the one I have buried on the workbench.  I have the exact same thing.  I believe the jumpers selected which die was used (for time duration).  It looks like there is a MIC input to the left of the pot.  I would assume you connect a microphone there and flip the switch to record.  I will also assume the same activation connection will begin recording when jumpered.  Then return to play and activate the board again to see if it recorded.  Looks like about 12 seconds.

You are dealing with my best guesses.  I was not involved with this device.

Lou N

@Lou N. thank you. I'll do some experimenting with it later, as soon as my bench clears a bit. You know how it is, if there's even a brief pause in the action, things just magically fly onto my bench like sirens beckoning to a sailor.

George